205567145 has 24 divisors (see below), whose sum is σ = 299494464. Its totient is φ = 132662016.

The previous prime is 205567139. The next prime is 205567157. The reversal of 205567145 is 541765502.

It is not a de Polignac number, because 205567145 - 2⁴ = 205567129 is a prime.

It is a super-2 number, since 2×205567145² = 84515702206902050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47 + ... + 20276.

It is an arithmetic number, because the mean of its divisors is an integer number (12478936).

Almost surely, 2^205567145 is an apocalyptic number.

It is an amenable number.

205567145 is a deficient number, since it is larger than the sum of its proper divisors (93927319).

205567145 is a wasteful number, since it uses less digits than its factorization.

205567145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20369 (or 20352 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 35.

The square root of 205567145 is about 14337.6129463729. The cubic root of 205567145 is about 590.1801087588.

The spelling of 205567145 in words is "two hundred five million, five hundred sixty-seven thousand, one hundred forty-five".